On Wed, 15. Apr 02:58, Mark Clayton wrote: > Hello, > > I have an Nvidia Jetson Nano, which while having CUDA does not feature an > nvenc capable encoder. Instead, a high level API using L4T ( > https://docs.nvidia.com/jetson/l4t-multimedia/classNvVideoConverter.html) > is supported. > > It’s been a while and it seems that this device is not popular enough to > warrant an ffmpeg patch, so I’m inclined to write one myself. There exists > a working encode/decode patch (https://github.com/jocover/jetson-ffmpeg) > not using the hwaccel headers. > > Is writing atop a high level api (first link) appropriate for a hwaccel > class, and if so where can I find documentation for how existing > accelerators (vaapi, nvenc) are skeletoned? I’m a decent C programmer but > have not contributed to ffmpeg before.
Nvidia's api for the Nano is based on v4l2m2m which we already support in libavcodec/v4l2_m2m* In the past, I attempted to get the Nano working with FFmpeg but came across several issues: - In addition to usual v4l2m2m workflow, the Nano requires calls to NvBufferMemSyncForCpu()/NvBufferMemSyncForDevice(). These are in a proprietary header which cannot be part of FFmpeg: https://docs.nvidia.com/metropolis/deepstream/dev-guide/DeepStream%20Development%20Guide/baggage/nvbuf__utils_8h_source.html - All ioctl() calls need to be done via libv4l2... There are ways to get around this as is done in libavdevice/v4l2.c - I often saw segfaults on the Nano coming from their version of libv4l2. Other users experienced this too: https://forums.developer.nvidia.com/t/vidioc-dqbuf-blocks/63414/10 In this forum, Nvidia's admin says that FFmpeg will be supported in r32.4... https://forums.developer.nvidia.com/t/building-ffmpeg-for-jetson-error-cuda-requested-but-not-all-dependencies-are-satisfied-ffnvcodec/118260 No idea whether this support is based on v4l2m2m... But I would be interested to see their sources :) -- Andriy _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
